feat: server grouping, hidden-library browsing

close #557, close #827

lib/i18n/en.i18n.json

@@ -108,6 +108,8 @@
     "useGlobalHubsDescription": "Show home page hubs like the official Plex client. When off, shows per-library recommendations instead.",
     "showServerNameOnHubs": "Show Server Name on Hubs",
     "showServerNameOnHubsDescription": "Always display the server name in hub titles. When off, only shows for duplicate hub names.",
+    "groupLibrariesByServer": "Group Libraries by Server",
+    "groupLibrariesByServerDescription": "Show a header for each Plex server in the sidebar when you're connected to multiple servers.",
     "alwaysKeepSidebarOpen": "Always Keep Sidebar Open",
     "alwaysKeepSidebarOpenDescription": "Sidebar stays expanded and content area adjusts to fit",
     "showUnwatchedCount": "Show Unwatched Count",
@@ -550,6 +552,8 @@
     "analysisStarted": "Analysis started for \"${title}\"",
     "failedToAnalyze": "Failed to analyze library: ${error}",
     "noLibrariesFound": "No libraries found",
+    "allLibrariesHidden": "All libraries are hidden",
+    "hiddenLibrariesCount": "Hidden libraries (${count})",
     "thisLibraryIsEmpty": "This library is empty",
     "all": "All",
     "clearAll": "Clear All",